Snowplow



A ril 12, 1932.

G. C. SOULE ET AL SNOWPLOW Filed Aug. 1, 1930 In van/Zora.

John B. Woo dbzuy Gear-ye 0. Joule.

Patented Apr. 12, 1932 UNIT D, TA ES PATENTOFFICE 1;; enonenc. sonLn ANDJOHNB. wooDBURY, or SOUTH PORTLAND, MAI E, nssrenons To MAINE sTEELrnonuccrs COMPANY, OF PORTLAND, MAINE, A CORPORATION OF V SNOWI'LOW f IApplication filed Aug"1 1 st1,193 0.' SeriaIIt'o 472,237.

- This invention relatesto snow plows, and particularly to theconstruction of the V or nose thereon Although 'not specifically 1limited to such use, our invention is especially 5 effective withtruck-propelled plows, andin the further discussion thereof herein, weshall refer to it asapplied to a truck plow; It will be understood,however, that this treatment r is purely illustrative'and in no waylimiting. Snow conditions in truck plowing as in all other kinds oftruck plowing are extremely variable. a a I f l Two specific conditionsconstantly being c c met in truck plowing'a-re not only'variable butopposing in their requirements for plow design. 'When plowing moderate'depths of snow at'speed, the object of the truck plow is to throw thesnow as far as possible oifthe road in order that it may neither have tobe handled again not: make side banks which tend to cause re-driftingandblocking-of the road." 'j

The truck plow which would most efficient- .7 ly'throwrthe snow off theroad'would be constructed with a sharp outward overhang at the top ofthe V softhat as the loose snow is forced upward by the speed ofthe V itstrikes 1 this overhang and is shot out to one side with l i greatvelocity. But through accident, neglector for many other reasons snowmay have accumulated, settled and frozen in great depth before the truckplow starts to move it or in which case the sharp outward overhang,which would make the most efi'ective snow throwingspeed plow, cramps thedeep heavy snow and makes it difiicult for the truck plow to penetrate.V

1 For such a condition of deep heavy snow a plow without the sharpoutward overhang would be more efiicient and would penetrate the driftswhere the speed plow would cramp because the absence of sharp outwardoverhang would permit the deep heavy snow to roll up past the top of theV as in a tractor snow. 7

The result in prevalent snow plow deslgn has been to enforce acompromise design;

plow which is primarily designed for deep drifts because the logicaldesign for the one design for the other, and because efliciency in theone field constitutes deficiency in the other field. Heret'ofore thepractical plows have'sacrificed some of the qualitiesnecessary toefficiency under" each condition in order to; copemoderately well withboth. I 7

7 Purpose is opposing in principle to the'logical To'the end thereforeof provlding. a snow iv plow which will be capable of operating withcomplete eflicienc-y regardless of which of these two snow. conditionsare met, we have and having its surface formed as'a continuation of thesurface curve of the main portion of the mouldboard. The snow rollingVip ortion is designed to lift and roll the snow higher than itselfbeing efficient for heavy snow'conditions, deep hard drifts and ingeneral for heavy duty work wherethe depthor, resistance of the snowreduces the speed and causes the propelling-"truckby reason .of reducedspeed to function similarly to atracto r.

The snow-rolling V should be specifically vdesigned for, penetratingsnow depths greater than the height of the V without cramping, and toavoid cramping, in deep snows must have only a" small amountof outwardoverhangatthe top so that the snow can roll smoothly upward in" adirection" approximating the vertical and so lift and pile the snowremoved on the top of the banks higher than the V. Forthe lighter; snowsor less compacted falls where speed. can "be main.-

t'ained it'is important that the plowthrow the v snow sharplyfoutwardlyin-a'di'rection in clined toward-the horizontal andlow enough 7 andfarenough to thezsi'deso thatjit wilfnot cover the windshield or obscurethe; vision of plow. of the snow -ro1 li type'fwere Operated eh theoperator which would be inevitable ifa a

